Petri Tiitta
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View article: Lidar estimates of birch pollen number, mass, and CCN-related concentrations
Lidar estimates of birch pollen number, mass, and CCN-related concentrations Open
The accurate representation of microphysical properties of atmospheric aerosol particles – such as the number, mass, and cloud condensation nuclei (CCN) concentration – is key to constraining climate forcing estimations and improving weath…
View article: Sources of particulate organic nitrates in the boreal forest in Finland
Sources of particulate organic nitrates in the boreal forest in Finland Open
Organic nitrates (ON) are known to be present in secondary organic aerosol and act as a reservoir of nitrogen oxides, regulating the local and regional ozone and hydroxyl radical budgets. This work reports observations of particulate ON in…
View article: Road-side measurements of aerosol and ion number size distributions : a comparison with remote site measurements
Road-side measurements of aerosol and ion number size distributions : a comparison with remote site measurements Open
We measured the number concentrations and size distributions of aerosol particles and air ions with a differential mobility particle sizer and air ion spectrometer, respectively, during a roadside campaign conducted in Kuopio (Savilahti), …
View article: Fine particle emissions from milled peat production
Fine particle emissions from milled peat production Open
Peat dust emissions and particle concentrations at different distances from a milled peat production field were studied for two different harvesting methods. The dust emissions were found to be sporadic. The momentary PM2.5 concentrations,…
View article: Lidar estimates of birch pollen number, mass and related CCN concentrations
Lidar estimates of birch pollen number, mass and related CCN concentrations Open
Accurate representation of microphysical properties of atmospheric aerosol particles – such as number, mass and cloud condensation nuclei (CCN) concentration – is key to constraining climate forcing estimations and improving weather and ai…
View article: Effect of Long‐Range Transported Fire Aerosols on Cloud Condensation Nuclei Concentrations and Cloud Properties at High Latitudes
Effect of Long‐Range Transported Fire Aerosols on Cloud Condensation Nuclei Concentrations and Cloud Properties at High Latitudes Open
Active vegetation fires in south‐eastern (SE) Europe resulted in a notable increase in the number concentration of aerosols and cloud condensation nuclei (CCN) particles at two high latitude locations—the SMEAR IV station in Kuopio, Finlan…
View article: Effect of long-range transported fire emissions on aerosol and cloud properties at high latitudes: In situ measurements and satellite observations
Effect of long-range transported fire emissions on aerosol and cloud properties at high latitudes: In situ measurements and satellite observations Open
Global warming and climate change-induced rise in Earth’s temperature have increased the frequency of forest/wildfires over the past decade. Therefore, understanding the effect of fire emissions on aerosol-cloud interactions is cruci…
View article: Chemical Fingerprinting of Biomass Burning Organic Aerosols from Sugar Cane Combustion: Complementary Findings from Field and Laboratory Studies
Chemical Fingerprinting of Biomass Burning Organic Aerosols from Sugar Cane Combustion: Complementary Findings from Field and Laboratory Studies Open
Agricultural fires are a major source of biomass-burning organic aerosols (BBOAs) with impacts on health, the environment, and climate. In this study, globally relevant BBOA emissions from the combustion of sugar cane in both field and lab…
View article: The effect of aging conditions at equal OH exposure in an oxidation flow reactor on the composition of toluene-derived secondary organic aerosols
The effect of aging conditions at equal OH exposure in an oxidation flow reactor on the composition of toluene-derived secondary organic aerosols Open
Analysis of physical-chemical aerosol properties challenges the concept of atmospherically relevant and irrelevant reactions in oxidation flow reactor chemistry.
View article: Spectral dependence of birch and pine pollen optical properties using a synergy of lidar instruments
Spectral dependence of birch and pine pollen optical properties using a synergy of lidar instruments Open
Active remote sensors equipped with the capability to detect polarization, a shape-relevant parameter, are essential to aerosol particle identification in the vertical domain. Most commonly, the linear particle depolarization ratio has bee…
View article: Comment on egusphere-2023-507 'Spectral dependence of birch and pine pollen optical properties using a synergy of lidar instruments'
Comment on egusphere-2023-507 'Spectral dependence of birch and pine pollen optical properties using a synergy of lidar instruments' Open
Abstract. Active remote sensors equipped with the capability to detect polarization, a shape relevant parameter, are essential to aerosol particle identification in the vertical domain. Most commonly, the linear particle d…
View article: Comment on egusphere-2023-507
Comment on egusphere-2023-507 Open
Abstract. Active remote sensors equipped with the capability to detect polarization, a shape relevant parameter, are essential to aerosol particle identification in the vertical domain. Most commonly, the linear particle d…
View article: Spectral dependence of birch and pine pollen optical properties using a synergy of lidar instruments
Spectral dependence of birch and pine pollen optical properties using a synergy of lidar instruments Open
Active remote sensors equipped with the capability to detect polarization, a shape relevant parameter, are essential to aerosol particle identification in the vertical domain. Most commonly, the linear particle depolarization ratio has bee…
View article: Photochemical Aging Induces Changes in the Effective Densities, Morphologies, and Optical Properties of Combustion Aerosol Particles
Photochemical Aging Induces Changes in the Effective Densities, Morphologies, and Optical Properties of Combustion Aerosol Particles Open
Effective density (ρeff) is an important property describing particle transportation in the atmosphere and in the human respiratory tract. In this study, the particle size dependency of ρeff was determined for fresh a…
View article: Codes and datasets related to Leinonen et al (2022) https://doi.org/10.1039/D2EA00048B
Codes and datasets related to Leinonen et al (2022) https://doi.org/10.1039/D2EA00048B Open
Codes and datasets related to Leinonen et al (2022) https://doi.org/10.1039/D2EA00048B
View article: Codes and datasets related to Leinonen et al (2022) https://doi.org/10.1039/D2EA00048B
Codes and datasets related to Leinonen et al (2022) https://doi.org/10.1039/D2EA00048B Open
Codes and datasets related to Leinonen et al (2022) https://doi.org/10.1039/D2EA00048B
View article: Aerosol–stratocumulus interactions: towards a better process understanding using closures between observations and large eddy simulations
Aerosol–stratocumulus interactions: towards a better process understanding using closures between observations and large eddy simulations Open
We carried out a closure study of aerosol–cloud interactions during stratocumulus formation using a large eddy simulation model UCLALES–SALSA (University of California Los Angeles large eddy simulation model–sectional aerosol module for la…
View article: Comment on acp-2022-273
Comment on acp-2022-273 Open
Abstract. We studied two cases of cloud formation, one diurnal (24 September 2020) and one nocturnal (31 October 2020), with high and low aerosol loadings, respectively. Aerosol number concentrations differ more than 1 ord…
View article: Intercomparison of holographic imaging and single-particle forward light scattering in situ measurements of liquid clouds in changing atmospheric conditions
Intercomparison of holographic imaging and single-particle forward light scattering in situ measurements of liquid clouds in changing atmospheric conditions Open
Upon a new measurement technique, it is possible to sharpen the determination of microphysical properties of cloud droplets using high resolving power imaging. The shape, size, and position of each particle inside a well-defined, three-dim…
View article: Comment on acp-2022-273
Comment on acp-2022-273 Open
Abstract. We studied two cases of cloud formation, one diurnal (24 September 2020) and one nocturnal (31 October 2020), with high and low aerosol loadings, respectively. Aerosol number concentrations differ more than 1 ord…
View article: Supplementary material to "Aerosol-stratocumulus interactions: Towards a better process understanding using closures between observations and large eddy simulations"
Supplementary material to "Aerosol-stratocumulus interactions: Towards a better process understanding using closures between observations and large eddy simulations" Open
This document contains additional information about the modelling closure study of aerosol-interactions using UCLALES-SALSA and in-cloud observations from the Puijo 2020 campaign.
View article: Aerosol-stratocumulus interactions: Towards a better process understanding using closures between observations and large eddy simulations
Aerosol-stratocumulus interactions: Towards a better process understanding using closures between observations and large eddy simulations Open
We studied two cases of cloud formation, one diurnal (24 September 2020) and one nocturnal (31 October 2020), with high and low aerosol loadings, respectively. Aerosol number concentrations differ more than 1 order of magnitude between cas…
View article: Reply on RC2
Reply on RC2 Open
Abstract. Upon a new measurement technique, it is possible to sharpen the determination of microphysical properties of cloud droplets using high resolving power imaging. The shape, size, and position of each particle insid…
View article: Reply on RC1
Reply on RC1 Open
Abstract. Upon a new measurement technique, it is possible to sharpen the determination of microphysical properties of cloud droplets using high resolving power imaging. The shape, size, and position of each particle insid…
View article: Closure study of aerosol-stratocumulus interactions with UCLALES-SALSA
Closure study of aerosol-stratocumulus interactions with UCLALES-SALSA Open
<p>We carried out a closure study of aerosol-cloud interactions during stratocumulus formation using a large eddy simulation model UCLALES-SALSA and in situ observations from the 2020 sampling campaign at the Puijo SMEAR IV station i…
View article: Comment on amt-2021-423
Comment on amt-2021-423 Open
Abstract. Upon a new measurement technique, it is possible to sharpen the determination of microphysical properties of cloud droplets using high resolving power imaging. The shape, size, and position of each particle insid…
View article: Comment on amt-2021-423
Comment on amt-2021-423 Open
Abstract. Upon a new measurement technique, it is possible to sharpen the determination of microphysical properties of cloud droplets using high resolving power imaging. The shape, size, and position of each particle insid…
View article: Supplementary material to "Intercomparison of holographic imaging and single-particle forward light scattering in-situ measurements of liquid clouds in changing atmospheric conditions"
Supplementary material to "Intercomparison of holographic imaging and single-particle forward light scattering in-situ measurements of liquid clouds in changing atmospheric conditions" Open
Supplement S1: Cloud boundaries for LWC estimationsCondensation of water vapor introduces strong vertical variations of cloud properties that can be used to define cloud boundaries.However, the location of cloud boundaries depends on the v…
View article: Intercomparison of holographic imaging and single-particle forward light scattering in-situ measurements of liquid clouds in changing atmospheric conditions
Intercomparison of holographic imaging and single-particle forward light scattering in-situ measurements of liquid clouds in changing atmospheric conditions Open
Upon a new measurement technique, it is possible to sharpen the determination of microphysical properties of cloud droplets using high resolving power imaging. The shape, size, and position of each particle inside a well-defined, three-dim…
View article: Modeling atmospheric aging of small-scale wood combustion emissions: distinguishing causal effects from non-causal associations
Modeling atmospheric aging of small-scale wood combustion emissions: distinguishing causal effects from non-causal associations Open
Simplified illustration of the modeling used in this study, see the section 2.2 for details.